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package org.glassfish.grizzly.servlet;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.glassfish.grizzly.http.server.Request;
import org.glassfish.grizzly.http.server.Response;

/**
 * Grizzly Servlet utilities.
 * 
 * @author Alexey Stashok
 */
public class ServletUtils {
    /**
     * Returns internal Grizzly {@link Request} associated with the passed
     * {@link HttpServletRequest}.
     * 
     * @param servletRequest {@link HttpServletRequest}
     * 
     * @throws IllegalArgumentException if passed {@link HttpServletRequest}
     *      is not based on Grizzly {@link Request}.
     * 
     * @return internal Grizzly {@link Request} associated with the passed
     * {@link HttpServletRequest}.
     */
    public static Request getInternalRequest(HttpServletRequest servletRequest) {
        if (servletRequest instanceof Holders.RequestHolder) {
            return ((Holders.RequestHolder) servletRequest).getInternalRequest();
        }
        
        throw new IllegalArgumentException("Passed HttpServletRequest is not based on Grizzly");
    }
    
    /**
     * Returns internal Grizzly {@link Response} associated with the passed
     * {@link HttpServletResponse}.
     * 
     * @param servletResponse {@link HttpServletResponse}
     * 
     * @throws IllegalArgumentException if passed {@link HttpServletResponse}
     *      is not based on Grizzly {@link Response}.
     * 
     * @return internal Grizzly {@link Response} associated with the passed
     * {@link HttpServletResponse}.
     */
    public static Response getInternalResponse(HttpServletResponse servletResponse) {
        if (servletResponse instanceof Holders.ResponseHolder) {
            return ((Holders.ResponseHolder) servletResponse).getInternalResponse();
        }
        
        throw new IllegalArgumentException("Passed HttpServletResponse is not based on Grizzly");
    }
    
}
